PISCO: Biomass on Islands
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PISCO data can be accessed here
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Average density (+/- standard error) of California sheephead Semicossyphus pulcher at 14 sites across four islands in Channel Islands National Marine Sanctuary monitored by the PISCO kelp forest monitoring program from 2003 to 2016. Sheephead are counted by SCUBA divers swimming along transect lines. Observed density was averaged across all monitoring sites at each island, including sites located inside and outside of marine reserves and conservation areas, to examine course-scale trends by island. At a finer scale, sheephead density is responding differently inside and outside of some marine protected areas (MPAs) in CINMS. A discussion of MPA effects in CINMS is available in MPA Effects.
NPS: Density on Islands
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Average density (+/- standard error) of California sheephead Semicossyphus pulcher at Channel Islands National Park kelp forest monitoring sites at the five islands in CINMS. Recent increases in average density of sheephead were observed at every island except for San Miguel (blue). Sheephead density was averaged across all monitoring sites at each island, including sites located inside and outside of marine reserves and conservation areas, to examine course-scale trends by island. At a finer scale, sheephead density is responding differently inside and outside of some marine protected areas (MPAs) in CINMS. A discussion of MPA effects in CINMS is available in MPA Effects. Note that juveniles (< 10 centimeters) were excluded from analysis.
LTER: Island vs Mainland
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Average number (+/- standard error) of California sheephead Semicossyphus pulcher at two island (dark blue) and nine mainland (light blue) sites monitored by the Santa Barbara Channel Long-term Ecological Research (SBC LTER) program. Abundance appears to be increasing at the island sites compared to the mainland sites.